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ANNALS NEW YORK ACADEMY OF SCIENCES 
Euomphalas n. sp. 
Naticopsis deformis 
Coloceras globular el 
Domatoceras Highlandense ? 
Metacoceras aff. inconspicuum 
Anisopyge inornata 
This fauna is characterized to some extent by the scarcity of brachiopods 
and the dominance of true mollusca. The brachiopods, though reduced in 
variety, are apt to be extremely abundant; especially is this true of the 
Producti, and to a less extent of Chonetes and Composita. Nautiloids are 
also unusually abundant, suggesting in some respects the Nautiloid fauna of 
the Texas “Permian,” though presumably the horizon is different. A 
resemblance especially close is shown to the Manzano fauna of the Rio 
Grande Valley in New Mexico. The facies is distinctly unlike the Penn¬ 
sylvanian or “Permian” faunas of the interior basin. 
About the same facies is shown by collections made at a somewhat higher 
horizon near Pine Spring, New Mexico. Still higher, from localities in the 
general vicinity of Mayhill, Ruidosa and Weed, on the eastern slope of the 
Sacramento Mountains, we have the following species from eight localities: 
Echinocrinus sp. 
Chonetes aff. Geinitzianus 
Productus Ivesi 
Productus Mexicanusl 
Productus subhorridusl 
Productus aff. Irgince 
Pugnax Osagensis var. pusilla 
Composita Mexicana 
Composita subtilita 
Nucula levatiformis 
Aviculipecten sp. (same at Cloudcroft.) 
Myalina aff. meliniformis 
Bakewellia ? sp. 
Plagioglypta canna 
Bellerophon sp. 
Euomphalus n. sp. 
Tainoceras sp. 
Grijffithides sp. 
Not far above this general horizon, Mr. Richardson thinks, would pass the 
plane which farther south, where the lithologic distinctions are more sharp, 
divides the Hueeo limestone from the Guadalupian, and several collections 
from the north end of the Guadalupe Mountains at Lower Penasco and 
Pretty Bird Creek, can, with considerable probability, be assigned to unde¬ 
termined horizons in the Guadalupian. A composite list of six collections 
showing the most important species is as follows: 
